A callback in this sense is a method of making low-cost international calls via a third country, usually the United States, where call charges are considerably lower.
In order to use a callback service, a subscriber is allocated a unique number in, for example, the US, which must first be dialled in order to trigger a return call. It may be possible to use the same number for many different subscribers, as the callback system will be able to recognise each subscriber’s registered number.
On hearing a ringing tone, the subscriber simply hangs up and awaits the callback. On receiving this, usually within a few seconds, the customer picks up the phone and dials the required number.
By: nouman88
Posted on: 2009-03-25 18:54:12
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(4 out of 5)
It cost about 10k Singapore dollar which is about 6.5k USD